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関連する概念動画

X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Cryo-electron Microscopy01:28

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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関連する実験動画

Updated: May 22, 2026

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
07:19

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

ネイティブの生物学的マクロモレキュルの異常な微分からの構造.

Qun Liu1, Tassadite Dahmane, Zhen Zhang

  • 1New York Structural Biology Center, National Synchrotron Light Source (NSLS) X4, Brookhaven National Laboratory, Upton, NY 11973, USA.

Science (New York, N.Y.)
|May 26, 2012
PubMed
まとめ
この要約は機械生成です。

この研究は,タンパク質の構造を決定するための新しい多結晶単波長異常微分法 (SAD) を導入しています. このアプローチは,ネイティブの異常分散を利用し,重原子の組み込みの必要性を排除し,従来の方法のよりシンプルな代替案を提供します.

さらに関連する動画

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
08:53

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Published on: October 2, 2017

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source
10:32

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source

Published on: April 23, 2021

関連する実験動画

Last Updated: May 22, 2026

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
07:19

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
08:53

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Published on: October 2, 2017

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source
10:32

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source

Published on: April 23, 2021

科学分野:

  • 構造生物学 構造生物学とは
  • クリスタログラフィーです.
  • バイオフィジックス 生物物理学

背景:

  • 結晶学的相問題を解くことは,新しい生物学的マクロモレキュルの構造をデノボで決定するために極めて重要です.
  • 従来の方法は,例えば,セレノメチオニルタンパク質を使用して,多波長異常 difraktion (MAD) または単一波長異常 difraktion (SAD) 実験を行うなど,重原子を組み込むことにしばしば依存しています.

研究 の 目的:

  • ネイティブマクロ分子からの固有異常散布を使用して,新しい結晶構造の決定のためのルーティン方法の開発と検証.
  • セレノメチオニルSAD実験の代替案として,重原子の組み込みの必要性を回避する.

主な方法:

  • 固有の異常分散からの信号対ノイズ比を高めるための堅牢な手順を開発しました.
  • 多結晶SADアプローチを用いて,より低いX線エネルギーで複数の結晶 (5〜13) のデータを組み合わせた.
  • 通常より低いX線エネルギーでデータを収集し,異常な分散信号を放大しました.

主要な成果:

  • 適度な解像度 (2.3〜2.8アンストーム) でネイティブタンパク質構造を成功裏に決定しました.
  • 異なる大きさのタンパク質 (127~1148残留) と硫黄原子数 (3~28) にこの方法を適用した.
  • 重原子の組み込みを必要とせずに,実証された日常的な構造決定.

結論:

  • 固有異常散布を用いた多結晶SAD方法は,新しい構造の決定のための実行可能で魅力的な代替手段です.
  • このテクニックは,重原子誘導の必要性を排除することによってプロセスを簡素化し,構造生物学をより容易に入手できるようにします.
  • この発見は,新しい生物学的マクロモレキュルの構造をより効率的に決定するための道を切り開いている.